 /*******************************************************************************
  * Copyright (c) 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.components.util;

 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.ui.internal.components.framework.IServiceProvider;

 /**
  * Converts an existing POJO into an IComponentProvider that returns the object itself
  * whenever asked for a class that the POJO implements. If the object implements IAdaptable,
  * it will also return adapters from the object.
  *
  * <p>EXPERIMENTAL: The components framework is currently under active development. All
  * aspects of this class including its existence, name, and public interface are likely
  * to change during the development of Eclipse 3.1</p>
  *
  * @since 3.1
  */
 public final class InstanceToServiceProviderAdapter implements IServiceProvider {
     private Object existingObject;
     
     public InstanceToServiceProviderAdapter(Object existingObject) {
         this.existingObject = existingObject;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.core.components.IComponentProvider#getComponent(java.lang.Object)
      */
     public Object getService(Object key) {
         if (key instanceof Class ) {
             Class c = (Class )key;
             
             if (c.isInstance(existingObject)) {
                 return existingObject;
             }
             
             if (existingObject instanceof IAdaptable) {
                 return ((IAdaptable)existingObject).getAdapter(c);
             }
         }
         return null;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.core.components.IComponentProvider#hasKey(java.lang.Object)
      */
     public boolean hasService(Object key) {
         return getService(key) != null;
     }
 }

